ACLS ACLS Cardiac Rhythms & ECG Interpretation 3

Question 1

Which of the following rhythms is SHOCKABLE in the ACLS pulseless arrest algorithm?

Accepted Answer

Ventricular fibrillation (VF)

Answer

Asystole

Answer

Pulseless electrical activity (PEA)

Answer

Idioventricular rhythm

Question 2

What QTc duration is generally considered prolonged and at risk for torsades de pointes?

Accepted Answer

>500 ms

Answer

>360 ms

Answer

>400 ms

Answer

>600 ms

Question 3

Accelerated idioventricular rhythm (AIVR) following myocardial infarction typically has what rate?

Accepted Answer

40–100 bpm

Answer

<40 bpm

Answer

100–150 bpm

Answer

>150 bpm

Question 4

Which lead is most useful for identifying P waves and distinguishing atrial arrhythmias in ACLS monitoring?

Accepted Answer

Lead II or V1

Answer

Lead I

Answer

Lead aVR

Answer

Lead aVL

Question 5

A patient presents with a regular wide-complex tachycardia at 200 bpm. Which ECG finding would MOST support a diagnosis of ventricular tachycardia over SVT with aberrancy?

Accepted Answer

AV dissociation (P waves marching through independently)

Answer

RBBB morphology

Answer

Narrow QRS in one lead

Answer

Short PR interval in sinus beats

Question 6

What does the presence of ST elevation in leads II, III, and aVF suggest in the context of ACLS?

Accepted Answer

Inferior STEMI

Answer

Anterior STEMI

Answer

Left bundle branch block

Answer

Hypertrophic cardiomyopathy